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    /* 超链接伪类 */
    a:link {
      color: skyblue;
      font-size: 30px;
    }
    a:visited {
      color: aquamarine;
    }
    a:focus {
      color: bisque;
    }
    a:hover {
      color: coral;
      font-size: 50px;
    }
    a:active {
      color: darkviolet;
    }
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